/* 宣传页：延续应用效果图的"极简留白"风格 */
#landing { --wrap: 1180px; color: var(--ink-1); }
#landing section { padding: 88px max(var(--gutter), calc((100% - var(--wrap)) / 2)); }
#landing h1, #landing h2, #landing h3 { text-wrap: balance; }
/* 标题不在词中间断行（v0.14 第二轮审查 P3：首屏标题"开始"被拆开、只剩一个"始"落在最后一行；韩语"뇌 / 를"拆开）。
   韩语按词（空格）断；中文首屏标题只在 <wbr> 标出的地方断（语言包里的 l.hero.title："从点亮 / 一个神经元开始"）；
   万一一个短语比一行还长（极窄的屏幕），overflow-wrap 兜底，不会撑出屏幕。日语用浏览器的按短语断行（支持的浏览器才生效） */
#landing :is(h1, h2, h3):lang(ko), #landing .hero h1:lang(zh) { word-break: keep-all; overflow-wrap: anywhere; }
#landing :is(h1, h2, h3):lang(ja) { word-break: auto-phrase; }

.l-nav {
  position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 28px; height: 72px;
  padding: env(safe-area-inset-top, 0px) max(var(--gutter), calc((100% - var(--wrap)) / 2)) 0;
  background: rgba(255, 255, 255, .86); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.l-links { display: flex; gap: 26px; margin-inline-start: 18px; }
.l-links a { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.l-links a:hover { color: var(--blue); }

/* ---------------------------------------------------------------- hero */
#landing .hero {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px; align-items: center;
  padding-top: 56px; padding-bottom: 72px;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin: 0; padding: 6px 12px; border-radius: 999px;
  background: var(--blue-soft); color: var(--blue-600); font-size: 13px; font-weight: 600;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(22, 163, 74, .15); }
.hero h1 { margin: 22px 0 0; font-size: clamp(38px, 4.6vw, 62px); line-height: 1.12; font-weight: 700; letter-spacing: -.01em; }
.hero h1 em {
  font-style: normal; color: var(--blue);
  background: linear-gradient(transparent 68%, rgba(37, 99, 235, .14) 68%);
}
.lead { margin: 22px 0 0; max-width: 34em; font-size: 17px; line-height: 1.8; color: var(--ink-2); }
.lead b { color: var(--ink-1); font-variant-numeric: tabular-nums; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-back { margin: 14px 0 0; color: var(--green-deep); font-weight: 500; }

.hero-stage {
  position: relative; height: min(620px, 70vh); min-height: 420px; border-radius: 22px; overflow: hidden;
  background: #fff; border: 1px solid var(--line); box-shadow: 0 30px 80px -40px rgba(37, 99, 235, .35);
}
.hero-stage .brain-host { position: absolute; inset: 0; }
.hero-loading {
  position: absolute; inset: 0; display: grid; place-content: center; gap: 12px; justify-items: center;
  color: var(--ink-3); font-size: 13px; background: #fff; transition: opacity .6s;
}
.hero-loading.done { opacity: 0; pointer-events: none; }
.spinner { width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--bg-muted); border-top-color: var(--blue); animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.hero-legend {
  position: absolute; inset-inline-start: 18px; top: 16px; display: flex; flex-wrap: wrap; gap: 6px 14px; padding: 8px 12px;
  border-radius: 10px; background: rgba(255, 255, 255, .9); border: 1px solid var(--line); font-size: 12px; color: var(--ink-2);
}
.hero-counter {
  position: absolute; inset-inline-start: 18px; bottom: 16px; display: flex; align-items: baseline; gap: 8px; padding: 10px 14px;
  border-radius: 12px; background: rgba(255, 255, 255, .92); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.hero-counter .k { font-size: 12.5px; color: var(--ink-2); }
.hero-counter b { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--green-deep); margin-inline-end: 8px; }
.hero-counter b:last-child { margin-inline-end: 0; color: var(--blue); }

.hero-forms {
  position: absolute; inset-inline-end: 16px; bottom: 16px; display: flex; gap: 2px; padding: 4px; border-radius: 12px;
  background: rgba(255, 255, 255, .92); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.hero-forms button { height: 30px; padding: 0 10px; border-radius: 8px; font-size: 12.5px; color: var(--ink-2); }
.hero-forms button:hover { background: var(--bg-soft); }
.hero-forms button[aria-pressed="true"] { background: var(--blue); color: #fff; }

/* ---------------------------------------------------------------- 五种形态 */
.forms-show .sub { margin: 14px 0 0; color: var(--ink-2); line-height: 1.7; }
.forms-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.form-card {
  position: relative; display: block; overflow: hidden; border-radius: 18px; border: 1px solid var(--line); background: #fff;
  color: inherit; text-decoration: none; transition: transform .25s, box-shadow .25s;
}
.form-card:hover { transform: translateY(-3px); box-shadow: 0 20px 50px -24px rgba(37, 99, 235, .35); }
.form-card img { display: block; width: 100%; height: auto; aspect-ratio: 720 / 536; object-fit: cover; }
.form-card.f-main { grid-column: span 2; }
.form-card.f-main img { aspect-ratio: 16 / 8.2; }
.fc-text { position: absolute; inset-inline: 14px; bottom: 14px; display: grid; gap: 2px; padding: 10px 14px; border-radius: 12px; background: rgba(255, 255, 255, .92); border: 1px solid var(--line); }
.fc-text b { font-size: 16px; }
.fc-text span { font-size: 12.5px; color: var(--ink-2); line-height: 1.5; }

/* ---------------------------------------------------------------- 通用小节 */
#landing .band { background: var(--bg-soft); }
.section-head { max-width: 760px; margin-bottom: 40px; }
.kicker { margin: 0 0 10px; font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: .06em; }
.section-head h2 { margin: 0; font-size: clamp(26px, 3vw, 38px); line-height: 1.25; font-weight: 700; }

.compare { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.compare article { padding: 26px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.compare h3 { display: flex; align-items: center; gap: 10px; margin: 0 0 16px; font-size: 19px; font-weight: 600; }
.compare h3 .ms { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--blue-soft); color: var(--blue); font-size: 20px; line-height: 36px; text-align: center; }
.compare p { margin: 0; padding: 12px 14px; border-radius: 10px; font-size: 14.5px; line-height: 1.6; }
.compare .before { background: var(--bg-soft); color: var(--ink-3); }
.compare .cmp-k { font-weight: 600; margin-inline-end: 1em; }
.compare .before .cmp-k { color: var(--ink-3); }
.compare .after { margin-top: 8px; background: var(--blue-soft); color: var(--ink-1); }
.compare .after .cmp-k { color: var(--blue); }

/* ---------------------------------------------------------------- 特点 */
.bento { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.bento .card {
  display: flex; flex-direction: column; justify-content: space-between; gap: 22px; padding: 26px; border-radius: 18px;
  background: #fff; border: 1px solid var(--line); min-height: 300px;
}
.bento .f-wide { grid-column: span 2; grid-row: span 2; }
.bento .f-wide .f-text p { max-width: 36em; }
.bento .f-wide .f-visual { padding: 22px; }
.bento .f-wide .pd-bars { row-gap: 14px; }
.f-text h3 { margin: 0 0 8px; font-size: 20px; font-weight: 600; }
.f-text p { margin: 0; color: var(--ink-2); line-height: 1.75; }
.f-visual { border-radius: 14px; background: var(--bg-soft); padding: 18px; }
/* 三格不被长标签撑宽（德语"Alltagsenglisch ≈"在手机上会把整列卡片撑出屏幕），长词自己断行 */
.progress-demo .pd-top { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.progress-demo .pd-top div { padding: 10px 12px; border-radius: 10px; background: #fff; }
.progress-demo .pd-top span { display: block; font-size: 12px; color: var(--ink-3); overflow-wrap: anywhere; hyphens: auto; }
.progress-demo .pd-top b { font-size: 22px; font-variant-numeric: tabular-nums; }
/* 三列（名称、进度条、数字）对齐：li 不占格子，名称列按最长的名称定宽（至少 86px，太长就换行） */
.pd-bars { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: minmax(86px, max-content) minmax(0, 1fr) max-content; gap: 10px; align-items: center; font-size: 12.5px; }
.pd-bars li { display: contents; }
.pd-bars span { max-width: 12em; line-height: 1.3; }
.pd-bars i { display: block; height: 7px; border-radius: 7px; background: #e3e8ef; position: relative; overflow: hidden; }
.pd-bars i::after { content: ""; position: absolute; inset-block: 0; inset-inline-start: 0; width: var(--p); border-radius: 7px; background: var(--green); }
.pd-bars em { font-style: normal; text-align: end; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.root-demo .rd-root { font-size: 22px; font-weight: 700; }
.root-demo .rd-root span { font-weight: 500; color: var(--ink-2); margin-inline-start: 6px; font-size: 18px; }
.rd-words { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.rd-words span { padding: 4px 10px; border-radius: 7px; background: #fff; border: 1px solid var(--line); font-size: 13px; }
.rd-words span.on { border-color: var(--green-line); background: var(--green-soft); color: var(--green-deep); }
.curve { width: 100%; height: auto; padding: 14px; }
.curve .axis { stroke: var(--line-strong); stroke-width: 1; }
.curve .decay { fill: none; stroke: var(--blue); stroke-width: 2.4; stroke-linejoin: round; }
.curve circle { fill: var(--green); }
.curve text { font-size: 10px; fill: var(--ink-3); font-family: var(--font-ui); }
.quiz-demo .qd-word { font: 600 26px var(--font-word); }
.quiz-demo ol { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 6px; }
.quiz-demo li { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 9px; background: #fff; border: 1px solid var(--line); font-size: 13.5px; }
.quiz-demo li span { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--bg-soft); font-size: 12px; font-weight: 600; color: var(--ink-2); }
.quiz-demo li.ok { border-color: var(--green); background: var(--green-soft); }
.quiz-demo li.ok span { background: var(--green-ink); color: #fff; }   /* 白字在 --green 上 3.3:1，不到 4.5:1（F09 复核） */
.quiz-demo li .ms { margin-inline-start: auto; color: var(--green-ink); font-size: 18px; }
.states-demo { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; font-size: 13.5px; }
.states-demo > span { padding: 10px 12px; border-radius: 10px; background: #fff; }
.states-demo .lg { width: 12px; height: 12px; }
.level-demo { display: flex; align-items: baseline; gap: 8px; }
.level-demo b { font-size: 44px; font-weight: 700; color: var(--blue); font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.level-demo { flex-wrap: wrap; }
.level-demo .k { color: var(--ink-2); }
.level-demo .range { flex-basis: 100%; font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- 怎么学 */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.steps li { position: relative; padding: 28px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.steps .n {
  display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: var(--blue); color: #fff;
  font-size: 18px; font-weight: 700;
}
.steps h3 { margin: 18px 0 6px; font-size: 20px; font-weight: 600; }
.steps p { margin: 0; color: var(--ink-2); line-height: 1.75; }

/* ---------------------------------------------------------------- FAQ + 结尾 */
#landing .faq { padding-top: 40px; }
.faq details { max-width: 820px; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 18px 0; font-size: 17px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-3); font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 18px; color: var(--ink-2); line-height: 1.8; max-width: 44em; }
#landing .final-cta { text-align: center; background: var(--blue-soft); }
.final-cta h2 { margin: 0; font-size: clamp(28px, 3.4vw, 44px); font-weight: 700; }
.final-cta p { margin: 12px 0 28px; color: var(--ink-2); }
.l-foot {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; padding: 28px max(var(--gutter), calc((100% - var(--wrap)) / 2)) calc(28px + env(safe-area-inset-bottom, 0px));
  color: var(--ink-3); font-size: 13px; border-top: 1px solid var(--line);
}

/* ---------------------------------------------------------------- 矮屏（v0.13）：笔记本的浏览器窗口（1366×768 屏幕里大约 657 高、1280×720）
   首屏的"开始点亮"要不用滚动就看得见：标题按窗口高度缩小，段落、间距收紧 */
@media (min-width: 961px) and (max-height: 900px) {
  #landing .hero { padding-top: 30px; padding-bottom: 56px; }
  .hero h1 { margin-top: 16px; font-size: clamp(34px, min(4.6vw, 6.6vh), 62px); }
  .lead { margin-top: 16px; font-size: 16px; line-height: 1.6; }
  .hero-langs { margin-top: 18px; }
  .hl-k { margin-bottom: 8px; }
  .hero-cta { margin-top: 22px; }
}
@media (min-width: 961px) and (max-height: 700px) {
  .hero h1 { font-size: clamp(32px, min(4.6vw, 6.4vh), 62px); }
  .lead { font-size: 15px; line-height: 1.6; }
  .hl-chip { height: 34px; padding: 0 13px; font-size: 14px; }
}

/* ---------------------------------------------------------------- 窄屏 */
@media (max-width: 960px) {
  #landing .hero { grid-template-columns: 1fr; gap: 32px; }
  .hero-stage { height: 460px; min-height: 0; }
  .compare, .steps { grid-template-columns: 1fr; }
  .bento { grid-template-columns: minmax(0, 1fr); }
  .bento .f-wide { grid-column: auto; grid-row: auto; }
  .bento .card { min-height: 0; }
  .l-links { display: none; }
  .forms-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  #landing section { padding-top: 56px; padding-bottom: 56px; }
  .hero-stage { height: 380px; border-radius: 16px; }
  .hero-legend { inset-inline: 12px; top: 12px; justify-content: center; }
  .hero-counter { inset-inline-start: 12px; bottom: 58px; }
  .hero-forms { inset-inline: 12px; bottom: 12px; justify-content: space-between; }
  .forms-grid { grid-template-columns: 1fr; }
  .form-card.f-main { grid-column: auto; }
  .form-card.f-main img { aspect-ratio: 720 / 536; }
  .pd-bars { grid-template-columns: minmax(76px, max-content) minmax(0, 1fr) max-content; }
  .pd-bars span { max-width: 7.5em; }
  .progress-demo .pd-top b { font-size: 18px; }
}

/* ---------------------------------------------------------------- 能做什么（v0.7：六个卖点，截图 + 真实界面元素） */
.tour .section-head { margin-bottom: 64px; }
.tour-row { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 64px; align-items: center; }
.tour-row + .tour-row { margin-top: 112px; }
.tour-row.flip { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); }
.tour-row.flip .tour-text { order: 2; }
.tour-n { display: inline-block; font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: .04em; }
.tour-text h3 { margin: 12px 0 14px; font-size: clamp(24px, 2.5vw, 32px); line-height: 1.3; font-weight: 700; }
.tour-text p { margin: 0; max-width: 36em; font-size: 16px; line-height: 1.8; color: var(--ink-2); }
.tour-text p + p { margin-top: 14px; }
.tour-text .cite { font-size: 13.5px; line-height: 1.7; color: var(--ink-3); padding-inline-start: 12px; border-inline-start: 2px solid var(--line-strong); }
.ticks { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 10px; max-width: 36em; }
.ticks li { position: relative; padding-inline-start: 30px; font-size: 15px; line-height: 1.65; }
.ticks li::before { content: ""; position: absolute; inset-inline-start: 0; top: .28em; width: 18px; height: 18px; border-radius: 50%; background: var(--green-soft); box-shadow: inset 0 0 0 1px var(--green-line); }
.ticks li::after { content: ""; position: absolute; inset-inline-start: 6.5px; top: calc(.28em + 3.5px); width: 4px; height: 8px; border: solid var(--green); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.ticks b { font-weight: 600; }

.tour-fig { position: relative; margin: 0; border-radius: 20px; background: #fff; border: 1px solid var(--line); box-shadow: 0 30px 80px -48px rgba(37, 99, 235, .45); }
.tour-fig img { display: block; width: 100%; height: auto; border-radius: 20px; }
.tf-card { position: absolute; background: rgba(255, 255, 255, .97); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-lg); padding: 14px 16px; }
/* 截图和示意图是某一个脑的：左上角标明是哪种语言（v0.11 的"英语脑的示例"，v0.13 起所有人都看得到） */
.f-visual { position: relative; }
.tour-fig > .fig-eg, .f-visual > .fig-eg {
  position: absolute; top: 0; inset-inline-start: 16px; transform: translateY(-50%); z-index: 2; max-width: calc(100% - 32px);
  padding: 3px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--line-strong);
  font-size: 12px; font-weight: 600; line-height: 1.4; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
/* "五种形态"的截图：标在小节标题下面（一行，同样的小标签） */
.fig-eg-line { margin: 14px 0 0; }
.fig-eg-line > .fig-eg {
  display: inline-block; padding: 3px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--line-strong);
  font-size: 12px; font-weight: 600; line-height: 1.4; color: var(--ink-2);
}

/* 01 词汇量测试：结果卡片 */
.tf-result { inset-inline-end: -18px; bottom: -24px; width: 236px; display: grid; gap: 2px; }
.tf-k { font-size: 12px; color: var(--ink-3); }
.tf-big { font-size: 34px; font-weight: 700; color: var(--blue); letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.15; }
.tf-range { font-size: 12px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.tf-bars { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 5px; }
.tf-bars li { display: grid; grid-template-columns: 58px 1fr; gap: 8px; align-items: center; font-size: 11.5px; color: var(--ink-2); }
.tf-bars i { display: block; height: 6px; border-radius: 6px; background: #e3e8ef; position: relative; overflow: hidden; }
.tf-bars i::after { content: ""; position: absolute; inset-block: 0; inset-inline-start: 0; width: var(--p); border-radius: 6px; background: var(--blue); }
.tf-lit { display: flex; align-items: center; gap: 6px; margin: 10px 0 0; padding: 7px 10px; border-radius: 9px; background: var(--green-soft); color: var(--green-deep); font-size: 13px; font-weight: 600; }
.tf-lit .ms { font-size: 17px; }

/* 02 关系线：用真实数据画的小网络 + 和应用里一样的说明卡片 */
.rel-fig { padding: 22px 22px 18px; background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.rel-svg { display: block; width: 100%; height: auto; overflow: visible; }
.rel-svg line { stroke-width: 2.2; stroke-linecap: round; }
.rel-svg .rl line.hot { stroke-width: 5; }
.rel-svg .rl line.half { stroke-dasharray: 2 6; }
.rel-svg .rl line.faint { opacity: .35; stroke-width: 1.4; }
.rel-svg .rl-dim line { stroke: #c9d0da; stroke-width: 1.3; stroke-dasharray: 3 5; }
.rel-svg .rl-spoke line { stroke: #7c3aed; stroke-width: 1.4; stroke-dasharray: 4 4; opacity: .7; }
.rel-svg circle { stroke: #fff; stroke-width: 2.5; }
.rel-svg circle.none { fill: #c3c9d3; stroke-width: 0; }
.rel-svg circle.learning { fill: #dbe7fd; stroke: #2563eb; stroke-width: 2; }
.rel-svg .hub { fill: #fff; stroke: #7c3aed; stroke-width: 2; }
.rel-svg text { font-family: var(--font-ui); }
.rel-svg .w { font: 600 15px var(--font-word); fill: var(--ink-1); }
.rel-svg .w.dim { fill: var(--ink-3); font-weight: 500; }
.rel-svg .z { font-size: 11.5px; fill: var(--ink-3); }
.rel-svg .h { font-size: 12px; font-weight: 600; fill: #7c3aed; }
.tf-card.tf-tip { position: relative; margin: 10px 0 0; margin-inline-start: auto; width: min(330px, 100%); font-size: 13px; color: var(--ink-2); }
.tf-tip p { margin: 6px 0 0; line-height: 1.55; }
.tf-tip p b { color: var(--ink-1); font-weight: 600; }
.tf-tip .rw { font: 600 15px var(--font-word); color: var(--ink-1); }
.tf-tip small { font-size: 12px; color: var(--ink-3); }
.rel-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 14px; font-size: 12.5px; color: var(--ink-2); }
.rel-legend span { display: inline-flex; align-items: center; gap: 6px; }
.rel-legend span::before { content: ""; width: 14px; height: 3px; border-radius: 2px; background: var(--c); }

/* 04 用法题 */
.cloze-fig { padding: 30px 28px; background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.cz-card { max-width: 460px; margin: 0 auto; }
.cz-ask { margin: 0; font-size: 13px; color: var(--ink-3); }
.cz-sent { margin-top: 10px; padding: 16px 18px; border-radius: 12px; background: #fff; border: 1px solid var(--line); font: 400 21px/1.6 var(--font-word); color: var(--ink-1); }
.cz-sent .blank { display: inline-block; width: 112px; height: 1.1em; margin: 0 4px; vertical-align: -3px; border-bottom: 2.5px solid var(--blue); }
.cz-opts { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 8px; }
.cz-opts li { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-radius: 11px; background: #fff; border: 1px solid var(--line); font: 600 17px var(--font-word); }
.cz-opts li span { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 7px; background: var(--bg-soft); font: 600 12px var(--font-ui); color: var(--ink-2); }
.cz-opts li:not(.ok) { color: var(--ink-3); }
.cz-opts li.ok { border-color: var(--green); background: var(--green-soft); }
.cz-opts li.ok span { background: var(--green-ink); color: #fff; }
.cz-opts li .ms { margin-inline-start: auto; color: var(--green-ink); font-size: 20px; }
.cz-zh { margin: 14px 0 0; padding: 12px 14px; border-radius: 11px; background: var(--green-soft); color: var(--green-deep); font-size: 14px; line-height: 1.6; }
.cz-zh b { font: italic 500 16px var(--font-word); color: var(--ink-1); }

/* 06 每天的节奏：状态一路变过去 */
.loop-fig { padding: 32px 26px 24px; background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.loop { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; position: relative; }
.loop::before { content: ""; position: absolute; inset-inline: 10%; top: 22px; height: 2px; background: linear-gradient(90deg, var(--line-strong), var(--blue-line)); }
.loop li { position: relative; display: grid; justify-items: center; align-content: start; text-align: center; gap: 4px; }
.lp-dot { position: relative; z-index: 1; display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.lp-dot::after { content: ""; width: 16px; height: 16px; border-radius: 50%; }
.lp-dot.none::after { width: 10px; height: 10px; background: #c3c9d3; }
.lp-dot.pre::after { display: none; }
.lp-dot.pre .ms { color: var(--blue); font-size: 21px; }
.lp-dot.learning::after { background: #dbe7fd; box-shadow: inset 0 0 0 2px #2563eb; }
.lp-dot.lit::after { background: #2563eb; box-shadow: 0 0 0 5px rgba(37, 99, 235, .16); }
.lp-dot.due::after { width: 22px; height: 22px; background: radial-gradient(circle, #2563eb 0 34%, #fff 35% 52%, var(--orange) 53%); }
.loop b { margin-top: 8px; font-size: 14px; }
.loop small { font-size: 12px; color: var(--ink-3); line-height: 1.45; }
/* 手机上每格只有 50 多 px：德语的长词（Wiederholung）要能断开，不然撑出屏幕 */
.loop b, .loop small { max-width: 100%; overflow-wrap: anywhere; hyphens: auto; }
.lp-gaps { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-top: 26px; padding: 12px 14px; border-radius: 12px; background: #fff; border: 1px solid var(--line); font-size: 13px; color: var(--ink-2); }
.lp-gaps .lp-t { font-weight: 600; color: var(--ink-1); margin-inline-end: 4px; }
.lp-gaps i { display: block; height: 2px; border-radius: 2px; background: var(--blue-line); }
.lp-gaps i:nth-of-type(1) { width: 14px; }
.lp-gaps i:nth-of-type(2) { width: 26px; }
.lp-gaps i:nth-of-type(3) { width: 42px; }
.lp-gaps .lp-n { margin-inline-start: auto; font-size: 12px; color: var(--ink-3); }

/* 更多细节：新卡片 */
.ex-demo .ex-en { margin: 0; font: italic 400 17px/1.5 var(--font-word); color: var(--ink-1); }
.ex-demo .ex-en b { color: var(--blue); font-weight: 600; }
.ex-demo .ex-zh { margin: 8px 0 0; font-size: 14px; color: var(--ink-2); }
.ex-demo .ex-cite { display: block; margin-top: 8px; font-size: 12px; color: var(--ink-3); }
/* 两列不被长词撑宽：俄语的"Существительное"在 960–1130px 会撑出卡片，长词自己断行 */
.pos-demo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; font-size: 13.5px; }
.pos-demo > span { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-radius: 10px; background: #fff; }
.pos-demo > span > span { min-width: 0; overflow-wrap: anywhere; hyphens: auto; }
.pos-demo i { flex: none; width: 12px; height: 12px; border-radius: 50%; }

/* 怎么学：四步 */
.steps.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 研究依据 */
.section-head .sub { margin: 14px 0 0; color: var(--ink-2); line-height: 1.7; }
.sci-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.sci-grid article { display: flex; flex-direction: column; gap: 10px; padding: 24px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.sci-grid h3 { margin: 0; font-size: 18px; font-weight: 600; }
.sci-grid p { margin: 0; color: var(--ink-2); line-height: 1.7; font-size: 14.5px; }
.sci-grid .sci-use { padding: 10px 12px; border-radius: 10px; background: var(--blue-soft); color: var(--ink-1); font-size: 14px; }
.sci-grid cite { margin-top: auto; padding-top: 4px; font-style: normal; font-size: 12.5px; color: var(--ink-3); }

/* 页面没加载成功时的提示（比如直接双击打开了 HTML 文件） */
.hero-loading.warn { color: var(--ink-1); font-size: 14px; line-height: 1.7; text-align: center; padding: 24px; }
.hero-loading.warn code { padding: 1px 6px; border-radius: 5px; background: var(--bg-soft); }

@media (max-width: 960px) {
  .tour-row, .tour-row.flip { grid-template-columns: 1fr; gap: 28px; }
  .tour-row.flip .tour-text { order: 0; }
  .tour-row + .tour-row { margin-top: 72px; }
  .tf-result { inset-inline-end: 12px; bottom: 12px; }
  .sci-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .tour .section-head { margin-bottom: 40px; }
  .tf-card.tf-result { position: relative; inset-inline-end: auto; bottom: auto; width: auto; margin: -14px 12px 12px; }
  .sci-grid, .steps.four { grid-template-columns: 1fr; }
  .loop-fig { padding: 24px 12px 16px; }
  .loop b { font-size: 12.5px; }
  .loop small { font-size: 11px; }
  .lp-dot { width: 38px; height: 38px; }
  .loop::before { top: 19px; }
  .lp-gaps .lp-n { margin-inline-start: 0; flex-basis: 100%; }
  .cloze-fig { padding: 20px 16px; }
  .cz-sent { font-size: 18px; }
  .rel-fig { padding: 16px 12px 14px; }
  .rel-svg .z { display: none; }
}

.bento .f-wide { justify-content: flex-start; }
.bento .f-wide .f-visual { flex: 1; display: flex; flex-direction: column; justify-content: center; }

/* ---------------------------------------------------------------- v0.9：界面语言 */
/* 不是英文界面时，语言包套上之前先不显示页面（index.html 的 lang-early，最多 3 秒） */
html.i18n-wait body { visibility: hidden; }
/* 从右到左（阿拉伯语）时，表示方向的图标镜像 */
[dir=rtl] .ms.flip, [dir=rtl] .rt-arrow { transform: scaleX(-1); }
.rt-arrow { display: inline-block; }
[dir=rtl] .loop::before { background: linear-gradient(270deg, var(--line-strong), var(--blue-line)); }
/* SVG 里的坐标是按从左到右画的，不跟着页面方向翻转 */
.rel-svg, .curve { direction: ltr; }
/* 字母间距会拆开阿拉伯文的连写，天城文也不需要 */
:is(:lang(ar), :lang(hi)) :is(.kicker, .tour-n, .hero h1, .logo) { letter-spacing: 0; }
/* "词脑"两个字只在中文界面里用；其他语言的标志是 LexiBrain */
html:not(:lang(zh)) .logo { font-family: var(--font-word); font-weight: 600; letter-spacing: -.01em; }

/* 导航栏里的语言选择 */
.lang-pick { position: relative; margin-inline-start: auto; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 10px; border-radius: var(--radius-sm);
  color: var(--ink-2); font-weight: 500; white-space: nowrap;
}
.lang-btn:hover, .lang-btn[aria-expanded="true"] { background: var(--bg-soft); color: var(--ink-1); }
.lang-btn .ms { font-size: 19px; }
.lang-btn .caret { font-size: 18px; color: var(--ink-3); }
.lang-menu {
  position: absolute; inset-inline-end: 0; top: calc(100% + 6px); z-index: 40; display: grid; gap: 1px; min-width: 210px;
  max-height: min(70vh, 520px); overflow-y: auto; padding: 6px;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-lg);
}
.lang-menu button { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 12px; border-radius: 8px; text-align: start; }
.lang-menu button:hover, .lang-menu button:focus-visible { background: var(--bg-soft); }
.lang-menu button[aria-checked="true"] { color: var(--blue); font-weight: 600; }
.lang-menu .ms { font-size: 18px; color: var(--blue); }
@media (max-width: 560px) {
  .l-nav { gap: 10px; }
  html:not(:lang(zh)) .l-nav .logo { font-size: 24px; }
  .lang-btn { padding: 0 8px; }
  .lang-btn .lang-name, .lang-btn .caret { display: none; }
  .l-nav .btn { min-width: 0; padding: 0 12px; }
  .l-nav .btn > span:first-child { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
}
/* 首屏计数器和形态按钮在同一行：其他语言的文字更长，计数器挪到形态按钮上面，免得叠在一起 */
html:not(:lang(zh)) .hero-counter { bottom: 64px; }
.hero-forms button { white-space: nowrap; }
@media (max-width: 560px) {
  .hero-forms { overflow-x: auto; scrollbar-width: none; }
  .hero-forms::-webkit-scrollbar { display: none; }
  .hero-forms button { flex: none; padding: 0 8px; }
}

/* 首屏：老用户的一行"你在学西班牙语 · 换一种语言"（v0.13） */
.hero-brain {
  display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; margin: 16px 0 0; padding: 5px 5px 5px 12px;
  border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--line); font-size: 14px; color: var(--ink-1); font-weight: 500;
}
.hero-brain > .ms { font-size: 18px; color: var(--blue); }
.hb-switch { height: 30px; padding: 0 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: var(--blue); font-weight: 600; font-size: 13px; }
.hb-switch:hover { border-color: var(--blue); background: var(--blue-soft); }

.brain-card {
  display: flex; flex-direction: column; gap: 20px; padding: 28px; border-radius: 18px;
  background: #fff; border: 1px solid var(--line); transition: border-color .2s, box-shadow .2s;
}
.bc-head { display: flex; align-items: center; gap: 14px; }
.bc-glyph {
  flex: none; display: grid; place-items: center; width: 54px; height: 54px; border-radius: 14px;
  background: var(--blue-soft); color: var(--blue); font: 600 25px/1 var(--font-word);
}
.bc-glyph.han { font: 700 27px/1 var(--font-zh, sans-serif); }
.bc-title { min-width: 0; }
.bc-title h3 { margin: 0; font-size: 22px; font-weight: 700; }
.bc-title p { margin: 2px 0 0; font-size: 14px; color: var(--ink-3); }
.bc-cur {
  margin-inline-start: auto; align-self: flex-start; display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px 4px 7px;
  border-radius: 999px; background: var(--green-soft); color: var(--green-deep); font-size: 12.5px; font-weight: 600; white-space: nowrap;
}
.bc-cur .ms { font-size: 16px; }
.ticks.bc-facts { margin: 0; }
.bc-facts li { font-size: 14.5px; }
.bc-k { display: block; margin: 0 0 7px; font-size: 12px; font-weight: 600; color: var(--ink-3); letter-spacing: .04em; }
.bc-hub {
  display: inline-flex; align-items: baseline; gap: 6px; padding: 5px 10px; border-radius: 8px;
  background: #fff; border: 1px dashed #a78bfa;
}
.bc-hub > b { font: 600 16px var(--font-word); color: #7c3aed; }
.bc-hz { display: inline-flex; align-items: baseline; gap: 5px; }
.bc-hz b { font-size: 20px; font-weight: 600; }
.bc-hub.zh-fam { border-color: color-mix(in srgb, var(--zh-char, #0369a1) 45%, #fff); }
.bc-hub.zh-fam b { color: var(--zh-char, #0369a1); }
.bc-hub.zh-rad b { color: var(--zh-radical, #9333ea); }
.bc-hub small { font-size: 12.5px; color: var(--ink-3); }
.bc-arrow { font-size: 17px; color: var(--ink-3); }
.bc-w {
  display: inline-flex; flex-direction: column; align-items: center; gap: 1px; min-height: 32px; justify-content: center; padding: 4px 10px;
  border-radius: 8px; background: #fff; border: 1px solid var(--line); font: 500 14.5px var(--font-word); color: var(--ink-1);
  cursor: pointer; transition: border-color .15s, transform .15s;
}
.bc-w:hover { border-color: var(--blue); transform: translateY(-1px); }
.bc-w.on { border-color: var(--green-line); background: var(--green-soft); color: var(--green-deep); }
.bc-w.zh b { font-size: 18px; font-weight: 500; line-height: 1.25; }
.bc-w .pinyin, .bc-hz .pinyin { font: 500 12px/1.2 var(--font-latin); }
.bc-hear { display: flex; align-items: center; gap: 6px; margin: 0; font-size: 12.5px; color: var(--ink-3); }
.bc-hear .ms { font-size: 16px; }
.no-tts .bc-hear { display: none; }
.no-tts .bc-w { cursor: default; }
.bc-go { margin-top: auto; align-self: flex-start; }

/* 页脚：隐私政策、服务条款 */
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-inline-start: auto; }
.foot-links a { color: var(--ink-2); text-decoration: none; }
.foot-links a:hover { color: var(--blue); text-decoration: underline; }
.foot-fb { padding: 0; border: 0; background: none; font: inherit; color: var(--ink-2); cursor: pointer; }
.foot-fb:hover { color: var(--blue); text-decoration: underline; }
/* 捐赠（v0.16）：页脚最后一个链接，前面一颗红心。捐赠开放以后才显示（data-donate，见 account.js）；
   FAQ"免费吗"的最后一句同样。句子之间的空格：中文、日文不要 */
.faq-donate { margin-inline-start: .3em; }
:lang(zh) .faq-donate, :lang(ja) .faq-donate { margin-inline-start: 0; }
.foot-links a.foot-donate { display: inline-flex; align-items: center; gap: 4px; color: var(--red-ink); font-weight: 600; }
.foot-links a.foot-donate .ms { font-size: 16px; color: var(--red); }
.foot-links a.foot-donate:hover { color: var(--red-ink); }

@media (max-width: 560px) {
  .brain-card { padding: 20px 18px; }
  .bc-head { flex-wrap: wrap; }
  .foot-links { margin-inline-start: 0; }
  .hero-brain { border-radius: 14px; padding: 8px 8px 8px 12px; }
}

/* v0.9：导航多了"语言"一项，西语、法语、俄语等的链接又长。不裁剪、不藏：放不下时链接的文字先折行，
   还放不下再换到第二排（多语言规则 10）。页眉最少 72px，真放不下就长高。960px 以下照旧全部隐藏 */
.l-nav { height: auto; min-height: 72px; }
.l-links { flex: 1 1 auto; min-width: 0; flex-wrap: wrap; align-items: center; align-content: center; gap: 2px 22px; line-height: 1.3; }
/* 按最窄（最长的一个词）排，再各自放宽到一行写得下为止 */
.l-links a { flex: 1 1 min-content; max-width: max-content; }
@media (min-width: 961px) {
  .l-nav { gap: 24px; }
  .l-links { margin-inline-start: 6px; }
}
/* 1260px 以下内容区不到 1180px：字和间距收紧一点 */
@media (min-width: 961px) and (max-width: 1260px) {
  .l-nav { gap: 18px; }
  .l-links { column-gap: 16px; font-size: 13.5px; line-height: 1.25; }
}
@media (min-width: 961px) and (max-width: 1100px) {
  .l-nav { gap: 14px; }
  .l-links { column-gap: 14px; font-size: 13px; }
}

/* 导航里的登录 / 注册（有账号服务器时显示） */
.l-signin { background: none; border: 0; padding: 8px 10px; font: inherit; font-size: 14px; font-weight: 500; color: var(--ink-2); cursor: pointer; white-space: nowrap; }
.l-signin:hover { color: var(--blue); }
.l-signup { white-space: nowrap; }
@media (max-width: 700px) { .l-signup { display: none; } }

/* ================================================================ v0.13：面向所有语言的宣传页 */
/* 首屏：七种语言的按钮（用这种语言自己的写法；选过的那种标出来） */
.hero-langs { margin-top: 26px; }
.hl-k { margin: 0 0 10px; font-size: 13px; font-weight: 600; color: var(--ink-3); }
.hl-list { display: flex; flex-wrap: wrap; gap: 8px; }
.hl-chip {
  height: 38px; padding: 0 15px; border-radius: 999px; border: 1px solid var(--line-strong); background: #fff;
  font: 500 15px var(--font-word); color: var(--ink-1); transition: border-color .15s, background .15s, transform .15s;
}
.hl-chip:is(:lang(zh-CN), :lang(ja), :lang(ko)) { font-family: var(--font-ui); }
.hl-chip:hover { border-color: var(--blue); background: var(--blue-soft); transform: translateY(-1px); }
.hl-chip:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
html.brain-chosen.brain-en .hl-chip[data-brain="en"], html.brain-chosen.brain-zh .hl-chip[data-brain="zh"], html.brain-chosen.brain-ja .hl-chip[data-brain="ja"],
html.brain-chosen.brain-ko .hl-chip[data-brain="ko"], html.brain-chosen.brain-es .hl-chip[data-brain="es"], html.brain-chosen.brain-fr .hl-chip[data-brain="fr"],
html.brain-chosen.brain-de .hl-chip[data-brain="de"] { border-color: var(--blue); background: var(--blue-soft); color: var(--blue-600); }
.hero .hero-cta { margin-top: 26px; }
.hero-cta .btn.ghost .ms { font-size: 20px; }

/* 首屏演示的进度："演示 · 第 3 个月"（计数器的第一行；换段时轻轻滑进来） */
.hero-counter { flex-wrap: wrap; row-gap: 4px; max-width: calc(100% - 36px); }
.hero-chapter { flex-basis: 100%; margin: 0; display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--ink-1); }
.hero-chapter[hidden] { display: none; }
.hero-chapter b { padding: 1px 7px; border-radius: 999px; background: var(--blue); color: #fff; font-size: 10.5px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }
.hero-chapter span:empty { display: none; }
.hero-chapter.flip-in span { animation: chapter-in .45s ease both; }
@keyframes chapter-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hero-chapter.flip-in span { animation: none; } }

/* 首屏下面的一排数字（七个脑合起来） */
#landing .strip { padding-top: 30px; padding-bottom: 30px; border-block: 1px solid var(--line); background: #fff; }
.strip-nums { margin: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
.strip-nums div { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 2px; padding-inline-start: 18px; border-inline-start: 1px solid var(--line); }
.strip-nums div:first-child { padding-inline-start: 0; border-inline-start: 0; }
.strip-nums dd { margin: 0; font-size: clamp(26px, 2.6vw, 36px); font-weight: 700; letter-spacing: -.02em; line-height: 1.15; font-variant-numeric: tabular-nums; }
.strip-nums dt { font-size: 13px; line-height: 1.4; color: var(--ink-3); }

/* 演示视频 + 章节 */
.demo-grid { display: grid; grid-template-columns: minmax(0, 3fr) minmax(220px, 1fr); gap: 28px; align-items: start; }
.demo-video {
  margin: 0; aspect-ratio: 16 / 9; border-radius: 20px; overflow: hidden; background: #0b1020;
  border: 1px solid var(--line); box-shadow: 0 30px 80px -40px rgba(37, 99, 235, .45);
}
.demo-video video { display: block; width: 100%; height: 100%; background: #0b1020; }
.demo-side .bc-k { margin-bottom: 10px; }
.demo-ch { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.demo-ch button { width: 100%; display: flex; align-items: baseline; gap: 12px; padding: 9px 12px; border-radius: 10px; text-align: start; font-size: 14.5px; color: var(--ink-1); }
.demo-ch button:hover, .demo-ch button:focus-visible { background: #fff; }
.demo-ch .dc-t { flex: none; min-width: 2.8em; font-size: 13px; font-weight: 600; color: var(--blue); font-variant-numeric: tabular-nums; }

/* 七种语言：一样的卡片 + "接下来" */
.brain-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.brain-grid .brain-card { gap: 16px; padding: 22px 20px; }
.brain-grid .bc-glyph { width: 46px; height: 46px; border-radius: 12px; font-size: 22px; }
.brain-grid .bc-title h3 { font-size: 19px; }
.brain-grid .bc-title p { font-size: 13px; }
.brain-grid .bc-head { flex-wrap: wrap; row-gap: 8px; }
.brain-grid .bc-facts li { font-size: 13.5px; }
.bc-sample { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 12px; border-radius: 12px; background: var(--bg-soft); min-height: 60px; }
.bc-rel { color: var(--ink-3); margin-inline: 2px; }
.bc-cog { padding: 3px 8px; border-radius: 7px; background: #fff; border: 1px solid var(--line); font: 500 14px var(--font-word); color: var(--ink-2); }
.brain-grid .bc-go { margin-top: auto; align-self: stretch; justify-content: center; height: 44px; }
.brain-card.next { border-style: dashed; background: transparent; justify-content: center; }
.bc-next-text { margin: 0; font-size: 14px; line-height: 1.6; color: var(--ink-3); }
.brains .bc-hear { margin-top: 16px; }
/* "正在学"：只在选过语言时、只标在自己的卡片上 */
.bc-cur { display: none; }
html.brain-chosen.brain-en .brain-card[data-card="en"] .bc-cur, html.brain-chosen.brain-zh .brain-card[data-card="zh"] .bc-cur,
html.brain-chosen.brain-ja .brain-card[data-card="ja"] .bc-cur, html.brain-chosen.brain-ko .brain-card[data-card="ko"] .bc-cur,
html.brain-chosen.brain-es .brain-card[data-card="es"] .bc-cur, html.brain-chosen.brain-fr .brain-card[data-card="fr"] .bc-cur,
html.brain-chosen.brain-de .brain-card[data-card="de"] .bc-cur { display: inline-flex; }
html.brain-chosen.brain-en .brain-card[data-card="en"], html.brain-chosen.brain-zh .brain-card[data-card="zh"],
html.brain-chosen.brain-ja .brain-card[data-card="ja"], html.brain-chosen.brain-ko .brain-card[data-card="ko"],
html.brain-chosen.brain-es .brain-card[data-card="es"], html.brain-chosen.brain-fr .brain-card[data-card="fr"],
html.brain-chosen.brain-de .brain-card[data-card="de"] { border-color: var(--blue-line); box-shadow: 0 0 0 1px var(--blue-line), 0 24px 60px -40px rgba(37, 99, 235, .5); }

/* 07 我的词表：粘贴的几行 → 对上的词（复数、过去式换成原形）和对不上的 */
.lists-fig { padding: 30px 26px; background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.lf-card { max-width: 460px; margin: 0 auto; display: grid; gap: 12px; }
.lf-title { margin: 0; display: flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 600; }
.lf-title .ms { font-size: 20px; color: var(--blue); }
.lf-paste {
  margin: 0; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line-strong); background: #fff;
  font: 14px/1.75 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; color: var(--ink-1); white-space: pre-wrap;
}
.lf-result { display: grid; gap: 10px; padding: 12px 14px; border-radius: 12px; background: #fff; border: 1px solid var(--line); }
.lf-ok, .lf-miss { margin: 0; display: flex; align-items: center; gap: 6px; font-size: 13.5px; }
.lf-ok { font-weight: 600; color: var(--green-deep); }
.lf-miss { color: var(--ink-3); }
.lf-ok .ms, .lf-miss .ms { font-size: 18px; }
.lf-words { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.lf-words li { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 8px; background: var(--green-soft); border: 1px solid var(--green-line); font: 500 14px var(--font-word); color: var(--green-deep); }
.lf-words li span:first-child { color: var(--ink-3); }
.lf-words .ms { font-size: 14px; color: var(--ink-3); }

/* 08 你的节奏：应用里"今天"的计划卡片（文字就是应用里的） */
.pace-fig { padding: 34px 26px; background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.pace-card { max-width: 500px; margin: 0 auto; padding: 18px 20px; background: #fff; box-shadow: var(--shadow); cursor: default; }
.pace-card:hover { border-color: var(--line); box-shadow: var(--shadow); }
.pace-card h3 { margin: 0 0 4px; font-size: 17px; }

/* 语源脑：大图 + 一词多语（同源组同一种颜色）+ 汉字音读对照 */
.or-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.or-fig { grid-column: 1 / -1; margin: 0; border-radius: 20px; overflow: hidden; border: 1px solid var(--line); background: #fff; box-shadow: 0 30px 80px -48px rgba(37, 99, 235, .45); }
.or-fig img { display: block; width: 100%; height: auto; }
.or-card { display: flex; flex-direction: column; gap: 10px; min-width: 0; padding: 22px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.or-card h3 { margin: 0; display: flex; align-items: center; gap: 8px; font-size: 18px; }
.or-card h3 .ms { font-size: 22px; color: var(--blue); }
.or-card > p { margin: 0; font-size: 14.5px; line-height: 1.7; color: var(--ink-2); }
.or-cog { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.cg { display: inline-flex; flex-direction: column; padding: 4px 9px; border-radius: 8px; border: 1.5px solid var(--c); background: color-mix(in srgb, var(--c) 7%, #fff); }
.cg b { font: 600 15px var(--font-word); color: var(--ink-1); }
.cg b:is(:lang(zh), :lang(ja), :lang(ko)) { font-family: var(--font-ui); }
.cg small { font-size: 11px; line-height: 1.3; color: var(--ink-3); }
.cg.none { border: 1px dashed var(--line-strong); background: #fff; }
.cg-root { flex-basis: 100%; margin: 6px 0 0; font-size: 13px; line-height: 1.6; color: var(--ink-2); }
.cg-root i { font: 600 14px var(--font-ipa); font-style: normal; color: #2563eb; }
.or-read-wrap { overflow-x: auto; margin-top: 4px; }
.or-read { border-collapse: collapse; width: 100%; font-size: 13.5px; }
.or-read th, .or-read td { padding: 7px 8px; text-align: start; vertical-align: top; border-bottom: 1px solid var(--line); white-space: nowrap; }
.or-read thead th { font-size: 11px; font-weight: 600; line-height: 1.35; color: var(--ink-3); white-space: normal; min-width: 4.2em; vertical-align: bottom; }
.or-read tbody th { font: 600 22px/1.2 var(--font-ui); }
.or-read td b { font-weight: 500; }
.or-read td small { display: block; font-size: 11px; color: var(--ink-3); }
.or-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 26px; }
.or-foot .btn { display: inline-flex; align-items: center; gap: 6px; text-decoration: none; }
.or-foot p { margin: 0; font-size: 13px; color: var(--ink-3); }

/* 按你的方式学：四个理由 + 一排说明 */
.way-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.way-grid article { display: flex; flex-direction: column; gap: 14px; padding: 22px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.way-grid h3 { margin: 0; display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 600; }
.way-grid h3 .ms { flex: none; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px; background: var(--blue-soft); color: var(--blue); font-size: 21px; }
.way-grid .ticks.bc-facts { margin: 0; }
.way-grid .bc-facts li { font-size: 14px; }
.way-go { margin-top: auto; align-self: flex-start; }
.way-facts { list-style: none; margin: 22px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 10px; }
.way-facts li { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--line); font-size: 13.5px; color: var(--ink-2); }
.way-facts .ms { font-size: 18px; color: var(--blue); }

/* 选语言（没选过语言的人点"开始"时） */
.chooser { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 24px 16px; background: rgba(15, 23, 42, .45); }
.chooser[hidden] { display: none; }
.chooser-card { position: relative; width: min(660px, 100%); max-height: calc(100vh - 48px); overflow-y: auto; padding: 28px; border-radius: 20px; background: #fff; box-shadow: var(--shadow-lg); }
.chooser-card h2 { margin: 0 0 6px; margin-inline-end: 44px; font-size: 24px; line-height: 1.3; }
.chooser-sub { margin: 0 0 18px; color: var(--ink-2); line-height: 1.6; }
.chooser-x { position: absolute; top: 14px; inset-inline-end: 14px; width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; color: var(--ink-2); }
.chooser-x:hover { background: var(--bg-soft); color: var(--ink-1); }
.chooser-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.chooser-opt { display: flex; align-items: center; gap: 12px; min-width: 0; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line); background: #fff; text-align: start; transition: border-color .15s, background .15s; }
.chooser-opt:hover, .chooser-opt:focus-visible { border-color: var(--blue); background: var(--blue-soft); outline: none; }
.chooser-opt .bc-glyph { width: 44px; height: 44px; border-radius: 12px; font-size: 21px; }
.co-name { display: grid; min-width: 0; }
.co-name b { font-size: 16px; font-weight: 600; }
.co-name small { font-size: 13px; color: var(--ink-3); }
.co-n { margin-inline-start: auto; font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }
body.chooser-open { overflow: hidden; }

#landing .faq.band { padding-top: 64px; }

@media (max-width: 1100px) {
  .brain-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .way-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .strip-nums { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 22px; }
  .strip-nums div:nth-child(3n + 1) { padding-inline-start: 0; border-inline-start: 0; }
  .demo-grid { grid-template-columns: 1fr; }
  .demo-ch { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .or-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .brain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .strip-nums { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .strip-nums div:nth-child(3n + 1) { padding-inline-start: 18px; border-inline-start: 1px solid var(--line); }
  .strip-nums div:nth-child(2n + 1) { padding-inline-start: 0; border-inline-start: 0; }
  .brain-grid, .way-grid, .chooser-list { grid-template-columns: minmax(0, 1fr); }
  .demo-ch { grid-template-columns: 1fr; }
  .chooser-card { padding: 22px 18px; }
  .lists-fig, .pace-fig { padding: 22px 14px; }
}